module UsersHelper
	# 返回指定用户的 Gravatar
	def gravatar_for(user, options = {size: 80})
		gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
		size = options[:size]
		gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
		image_tag(gravatar_url, alt: user.name, class: "gravatar")
	end
	# def gravatar_for(user, size: 80)
	# 	gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
	# 	size = options[:size]
	# 	gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
	# 	image_tag(gravatar_url, alt: user.name, class: "gravatar")
	# end
end
	